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Revenue Recognition - Additional Information (Details) - USD ($)
$ in Millions
Dec. 31, 2019
Dec. 31, 2018
Jan. 01, 2018
Dec. 31, 2017
Dec. 31, 2016
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]          
Stockholders' Equity Attributable to Parent $ (4,364) $ (2,092)      
Retained earnings          
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]          
Stockholders' Equity Attributable to Parent $ 14,220 13,912   $ 14,130 $ 13,625
Retained earnings | Cumulative Effect, Period of Adoption, Adjustment          
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]          
Stockholders' Equity Attributable to Parent   $ 0 $ 8 $ 8 $ 0